Add missing deviceType property in Message interface (#1510)

Co-authored-by: Rajeh Taher <rajeh@reforward.dev>

index.d.ts

@@ -604,6 +604,8 @@ declare namespace WAWebJS {
         ack: MessageAck,
         /** If the message was sent to a group, this field will contain the user that sent the message. */
         author?: string,
+        /** String that represents from which device type the message was sent */
+        deviceType: string,
         /** Message content */
         body: string,
         /** Indicates if the message was a broadcast */